Power BI guidance for Zerto Analytics

Trying to connect to Analytics via Power BI.  Just looking for license usage at this point.  Anyone have any suggestions for how to form the request in Power BI?  I am attempting using below:

URL – http://analytics.api.zerto.com/v2/auth/token’

accept – application/json

Here’s the error message:
Unable to connect
We encountered an error trying to connect.
Details: “Web.Contents failed to get contents from ‘http://analytics.api.zerto.com/v2/auth/token’ (503): Service Unavailable”